<template>
   
  <div>
    <el-upload action="http://gulimall-l33.oss-cn-shanghai.aliyuncs.com"
               :data="dataObj"
               list-type="picture"
               :multiple="false"
               :show-file-list="showFileList"
               :file-list="fileList"
               :before-upload="beforeUpload"
               :on-remove="handleRemove"
               :on-success="handleUploadSuccess"
               :on-preview="handlePreview">
      <el-button size="small"
                 type="primary">点击上传</el-button>
      <div slot="tip"
           class="el-upload__tip">
        只能上传jpg/png文件，且不超过10MB
      </div>
    </el-upload>
    <el-dialog :visible.sync="dialogVisible">
      <img width="100%"
           :src="fileList[0].url"
           alt="" />
    </el-dialog>
  </div>
</template>
<script>
import { policy } from './policy'
import { getUUID } from '@/utils'

export default {
  name: 'singleUpload',
  props: {
    value: String
  },
  computed: {
    imageUrl () {
      return this.value
    },
    imageName () {
      if (this.value != null && this.value !== '') {
        return this.value.substr(this.value.lastIndexOf('/') + 1)
      } else {
        return null
      }
    },
    fileList () {
      return [
        {
          name: this.imageName,
          url: this.imageUrl
        }
      ]
    },
    showFileList: {
      get: function () {
        return (
          this.value !== null && this.value !== '' && this.value !== undefined
        )
      },
      set: function (newValue) { }
    }
  },
  data () {
    return {
      dataObj: {
        policy: '',
        signature: '',
        key: '',
        ossaccessKeyId: '',
        dir: '',
        host: ''
        // callback:'',
      },
      dialogVisible: false
    }
  },
  methods: {
    emitInput (val) {
      this.$emit('input', val)
    },
    handleRemove (file, fileList) {
      this.emitInput('')
    },
    handlePreview (file) {
      this.dialogVisible = true
    },
    beforeUpload (file) {
      let _self = this
      return new Promise((resolve, reject) => {
        policy()
          .then((response) => {
            console.log('响应的数据：', response)
            _self.dataObj.policy = response.data.policy
            _self.dataObj.signature = response.data.signature
            _self.dataObj.ossaccessKeyId = response.data.accessid
            // eslint-disable-next-line no-template-curly-in-string
            _self.dataObj.key = response.data.dir + getUUID() + '_${filename}'
            _self.dataObj.dir = response.data.dir
            _self.dataObj.host = response.data.host
            console.log('响应的数据：', _self.dataObj)
            resolve(true)
          })
          .catch(() => {
            reject(new Error(false))
          })
      })
    },
    handleUploadSuccess (res, file) {
      console.log('上传成功...')
      this.showFileList = true
      this.fileList.pop()
      this.fileList.push({
        name: file.name,
        url:
          this.dataObj.host +
          '/' +
          // eslint-disable-next-line no-template-curly-in-string
          this.dataObj.key.replace('${filename}', file.name)
      })
      this.emitInput(this.fileList[0].url)
    }
  }
}
</script>
<style>
</style>


